Unable to get serverGuid in vsphere-ui plugin 6.7

I have plugin deployed on vsphere 6.7 on both Flex and HTML version.

Plugin is developed using html-client sdk . Now post-deployment vsphere-client[Flex] web-platform.js gives proper serverGuid but same fails on html client i.e vsphere-ui.

Flex client return proper serverGuid = xxxx xxx xxx xxx

whereas in html client we are getting serverGuid as null.

/ Get the info provided in a global view using a vCenter selector

      WEB_PLATFORM.getVcSelectorInfo = function() {

         var info = {serviceGuid: getURLParameter("serviceGuid"),

                     sessionId: getURLParameter("sessionId"),

                     serviceUrl: getURLParameter("serviceUrl")};

         return info;

      };

Thanks